‘Shake well before use’. This is the instruction on a bottle of medicine. What kind of a mixture is contained in the bottle? Give reason.

Bottle of the medicine such as cough syrup is colloidal mixture that comes under category of emulsion in which liquids immiscible with one another are taken together.

It is advised to shake the contents of the bottle as particles inside the bottle settle down after sometime so in order to mix well the particle thoroughly so that its composition becomes same throughout.